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CVE-2025-4565— Unbounded recursion in Python Protobuf

Quick assessment

Affected
protocolbuffers Python-Protobuf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Protobuf Pure-Python是Protobuf开源的一个谷歌的数据交换格式。 Protobuf Pure-Python存在安全漏洞，该漏洞源于解析递归数据时超过Python递归限制，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-4565

Vulnerability Information
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Vulnerability Title
Unbounded recursion in Python Protobuf
Source: CVE Program / CVE List V5
Vulnerability Description
Any project that uses Protobuf Pure-Python backend to parse untrusted Protocol Buffers data containing an arbitrary number of recursive groups, recursive messages or a series of SGROUP tags can be corrupted by exceeding the Python recursion limit. This can result in a Denial of service by crashing the application with a RecursionError. We recommend upgrading to version =>6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Protobuf Pure-Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Protobuf Pure-Python是Protobuf开源的一个谷歌的数据交换格式。 Protobuf Pure-Python存在安全漏洞，该漏洞源于解析递归数据时超过Python递归限制，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
protocolbuffers Python-Protobuf 0 ~ 4.25.8 -
protocolbuffers Python-Protobuf 0 ~ 4.25.8 -

II. Public POCs for CVE-2025-4565

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III. Intelligence Information for CVE-2025-4565

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IV. Related Vulnerabilities

Same vendor: protocolbuffers
Same weakness: CWE-674

V. Comments for CVE-2025-4565

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